Well now that Motiv has officially posted on these I can participate in here.
The New Tank Rampage Pearl is going to be the closest MCP to urethane, by oil absorption rules it classifies as urethane, and it's hard for the PBA rules. Pro's used it a ton this past week at the Players, ton of surface, but it being weaker than the Yellowjacket allowed them to play straighter, longer as the players of the other ball companies are finding with their 78D balls.
The Evoke is going to be interesting, haven't drilled mine yet, but the core shape is going to really show differences in layouts. It's always been the case that some cores get affected by drillings more/less than others, this Evoke was designed to have a core that will really cut the diff down if you go with a low pin layout, and if you go high pin, the post drilling diff is going to be quite high. I will be drilling two of these right off the jump just to see for myself, but i'm intrigued.
US Open coming up, so both balls will be popping up quite a bit soon for the touring guys and us staff guys, and the release date is February 14th.